Cam lapping machine



Sept. 7, 1937. H. s. INDGE ET AL CAM LAPPING MACHINE Filed Aug. 21, 1936 7 Sheets-Sheet 2 madam .1 Fl. 3 2/ 5 7 9 4 0 4 3 3 563 Z 6 Sept. 7, 1937. H. s. INDGE ET AL CAM LAPPING MACHINE Filed Aug. 21, 1956 7 Sheets-Sheet 3 T 4 W5 W DB w mmm E 55 i Eu 5 QM M .whM M MEN MMN MN CAM LAPPING MACHINE Filed Aug. 21, 1936 7 Sheets-Sheet 5 HERBERT .SZINUEE E'EIJRRE E. HUL BERT P 1937- H. s. INDGE ET AL 2,092,734

CAM LAE PING MACHINE Filed Aug. 21, 1936 7 Sheets-Sheet 6 ZS I 315 31g 2] 4 =3 Z76 Z9] 90 Z40 E'EUREE E. HLJL BERT HERBERT Ifi GMM Patented Sept 7, 1937 PATENT OFFICE AM LAPPIN G MACHINE Herbert S. Indge and George E. Hulbcrt, Westboro,- Mass, assignors to Norton Company, Worcester, Mass., a corporation of Massachusetts Application August 21,

21 Claims.

This invention relates to abrading machines, and more particularly to a camshaft lapping machine.

One object of this invention is to provide a simple and thoroughly practical lapping machine for simultaneously lapping or polishing a plurality of cams on a camshaft. A further object of this invention is to provide a camshaft lapping machine in which all of the cams and bearing surfaces on 0 a camshaft may be simultaneously lapped. Another object of this invention is to provide a lapping machine for simultaneously lapping the cams on a camshaft in which a plurality of lapping arms are provided, each being, controlled by .a

master camshaft. A further object of the invention is to provide a camshaft lapping machine for simultaneously lapping all of the cams on a camshaft, in which .a time control mechanism is provided to stop the lapping operation after the camshaft has been rotated a predetermined number of rotations.

A further object of the invention is to provide a plurality of bearing and cam lapping arms on a pivotally mounted support which may be swung to and from an operating position. A further object of the invention is to provide a fluid pressure control mechanism for simultaneously moving all of the cams and bearing lapping arms to and from an operating position. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts,as will be exemplified in the structure to be hereinafter described, and the scope of the applieationpf which will be indicated in the following claims.

In the accompanying drawings in which is shown one of various possible embodiments of the mechanical features of this invention,

Fig. 1 is a front elevation of the improved camshaft lapping machine;

Fig. 2 is a fragmentary plan view, on an enlarged scale, of the assembled cam and bearing lapping arms, showing the camshaft to be lapped and the master camshaft;

Fig. 3 is a cross-sectional view, on an enlarged scale, taken approximately on the line 3-3 of Fig. 2; 4

Fig.4 is a fragmentary plan view of the machine, showing the reciprocating mechanism for the cam lapping arms;

- Fig. 5 is a fragmentary sectional view, on an enlarged scale, taken approximately on the line 5-5 of Fig. 4, of the reciprocating mechanism for the cam lapping arms;

1936, Serial No. 97,232

Fig. 6 is a fragmentary end elevation of the improved camshaft lapping machine;

Fig. 'l is'a cross-sectional view, on an enlarged scale, taken approximately on the line of Fig. 1, with the footstock removed and the end bearing lapping arm and its supporting parts shown in elevation, together with the actuating mechanism for moving all of the lapping arms to and from an operating position;

Fig. 8 is a fragmentary sectional view, on an enlarged scale, taken approximately on the line 8--8 of Fig. 1, showing a cam lapping arm in elevation;

Fig. 9 is a sectional view through the footstock,

on an enlarged scale, taken approximately on the line 99 of Fig. 6;

Fig. '10 is a cross-sectional view through the footstock control valve, taken approximately onthe line |ll-l|lof Fig. 9;

Fig. 11 is a longitudinal sectional view, taken approximately on the line of Fig. 10;

Fig. 12 is a fragmentary cross-sectional view, on an enlarged scale, taken approximately on the line |2--|2 of Fig. 1;

Fig. 13 is a fragmentary longitudinal sectional view, taken. approximately on the line |3-|3 of Fig. 12;

Fig. 14 is a fragmentary phantom view of the cycle timing mechanism; and

Fig. 15 is a fragmentary sectional view, taken approximately on the line |5--| 5 of Fig. 13.

A camshaft lapping machine has been illustrated in the drawings comprising a base 2|! which supports a longitudinally reciprocable work supporting table 2|. The table 2| in turn supports a headstock 22 and a footstock 23 which are arranged to rotatably support a camshaft 24 for a lapping operation.

Table waysare provided between the base 20 and the table 2| which in the preferred form are of an anti-friction type. The base 20 is provided with a plate 26 which is fixed to the base and is provided at its edge portion with grooves 21 and 28 which serves as an inner raceway for a pair of spaced rows of anti-friction balls 29 and 30. The 4 table 2| is provided with outer raceways 3| and 32 which are grooved to bear against the antifriction ba1ls'29 and 3|), respectively. A cage 33 and 34 is provided between the races to space the 0 balls longitudinally, as desired. This construction forms an anti-friction way whereby the table 2|, together with the headstock 22 and the footstock 23 may be readily reciprocated during the lapping operation.

Headstock The headstock 22 is provided'with a rotatable spindle 48 which is supported in anti-friction bearings 4I and 42 in the headstock casing. The

headstock spindle 48 may be rotated from any suitable source of power, such as an overhead belt drive or a self-contained electric motor. In the preferred construction, an electric motor 43 is mounted on the base of the machine. A motor shaft 44 is provided with a driving pulley 45 which is connected by driving belts 46 with a pulley 41 which is mounted on the outer end of a transverse shaft 48 which is fixed to the headstock 22. A clutch 49 serves to connect the shaft 48 with a drive shaft 58 which is journaled in bearings 5i and 52 in the headstock 22. The shaft 58 carries a worm 53 which meshes with a worm gear 54 which is mounted on the spindle 48 and is locked thereto by means of a key 55.

When the movable clutch member 49 is moved toward the left (Fig. 12), the shaft 48 is connected through the clutch member 49 to rotate the shaft 58, the worm 53 and worm gear 64, transmitting a rotary motion to the headstock spindle 40. When the clutch member 48 is moved toward the right, it serves to disconnect the power driven shaft 48 and to brake the rotation of the shaft 58 so as quickly to stop the rotation of the spindle 48 and the camshaft 24.

Table reciprocation In the lapping of a camshaft or other similar work piece, it is desirable to provide a relative reciprocatory movement between the work piece and the abrading element to prevent the production of grain markings on the surface of the work .piece. In the present case, the work table 2| is arranged for a longitudinal reciprocatory movement. This is preferably accomplished by a translation of the rotary motion of the headstock spindle 48 into a reciprocatory movement for the table 2|. .The spindle 48 is provided with a gear 68 which meshes with a gear 6| mounted on a rotatable shaft 62. The shaft 62 carries a spiral gear 63 meshing with a spiral gear 64 I the spindle is transmitted through the gear 68,

mounted on the upper end of a vertically arranged shaft 65. The shaft 66 is Journaled in bearings 66 and 61 in the headstock casing 22. An eccentric 68 is formed on the lower end of the shaft 65. The eccentric 68 is-connected through an anti-friction bearing 69 with one end of a connecting rod I8. In order to facilitate adjustment of the reciprocatory motion transmitted by the eccentric 68, an adjustable eccentric bushing 86 fits on the eccentric 68 and its outer periphery carries the bearing 69. By adjusting the eccentric bushing, the reciprocatory stroke produced by the eccentric pin 68 may be varied. The other end of the connecting rod 18 is connected by a stud II with the base 28. As illustrated, the stud II is mounted on the member 26 which is in turn rigidly fixed to the base 28. It will be readily apparent from the foregoing disclosure that when the spindle 48 is rotated to rotate the work piece or camshaft 24, the rotary motion of the gear 6|, the shaft 62, the spiral gear 68,the spiral gear 64, to rotate the shaft 65 and the eccentric 68 which, through the anti-friction bearing 69 and the connecting rod 18, serves to cause a longitudinal reciprocatory movement of the table 2i so as to relatively reciprocate the work piece relative to the lapping members.

The clutch member 49 is arranged so that it headstock 22. A downwardly extending lever 18 is connected on the outer end of the shaft I! and is connected by a stud I9 with a link 88 which is connected by a stud or pin 8I carried by a. downwardly extending lever 82 which is mounted on the rock shaft 13. When the lever is moved into the position (Fig. 14), the clutch member 49 is shifted into a driving position so as to connect the drive shaft 48 with the shaft 58 to cause a rotation of the headstock spindle 48 and the camshaft 24. The lever 16 may be moved in a clockwise direction (Fig. 14) to rock the arm 82 ina clockwise direction which serves to shift the clutch member 15 toward the left (Fig. 14) to disconnect the driving shaft 48 from the shaft 58 and thereby apply the brake to stop the rotation of the shaft 58 and also the headstock spindle 48 and the camshaft 24. A spring 83 connected between the stud 8| carried by the arm 82 and a stud 84 fixed on the headstock casing 22 exerts a tension tending to hold the clutch member 49 in a braking position.

Work support The headstock spindle 48 serves as a rotatable support and driver for the camshaft 24 to be lapped. As illustrated in the drawings, a work driving member 86 is slidably keyed, to the spindle 48 by means of a key 81. The member 86 is provided with a recess 88 which is arranged to receive the flanged end of a camshaft, the outer diameter of the recess 88 being of a size to receive the peripheral surface of the flanged end of a camshaft. The driving member 86 .is provided with a spring-pressed driving pin 89 which engages a locating hole in the flange on the end of the camshaft 24 to locate the camshaft in a deflnite relation with the driving spindle and to serve as a driving means to positively rotate the camshaft with the headstock spindle 48. To facilitate loading of a work piece into the machine, the work driving member 86 isarranged so that it may be moved longitudinally on'the spindle. The driving member 86 is provided with a peripheral groove 88 .which is straddled by a yoked member 9| having opposed pins 92 which ride in the groove 98. --'Ihe yoked member 9| is pivotally mounted on a stud 93 and is connected to a downwardly projecting actuating lever 94 by means of which the driving member 86 may be withdrawn to facilitate loading of a work piece into the machine.

Footstoclc The other end of the camshaft 24 is supported by the rootstock 28 which is provided with a footstock center I88 which is carried by a rotatable spindle I8I. The spindle MI is jo'urnaledin bearings I82 and I83 within a hollow slidably mounted sleeve I84. The sleeve I84 is slidably keyed by means of a key I within an aperture I86 in the footstock frame 28.

A fluid pressure actuating mechanism is provided to move the rootstock center I88 rapidly to and from an operative position to support a camshaft within the machine. This mechanism comprises a fluid pressure cylinder 8 having a slidably mounted piston III contained therein. The piston III is connected to one end of a piston rod H2, the other end of which is connected through a pin I I3. The central portion of the pin H3 is slabbed off on opposite sides so as to slide within an elongated slot II4 formed at the lower end of the piston rod H2. The pin H3 serves as a central pivotal connection between a pair of toggle levers H5 and H6. The toggle lever H6 is connected to the footstock frame 23 by means of a stud H1. lever H5 is connected by a stud H8 with a slidably mounted sleeve II9 which slides within an aperture I within the sleeve I04. The sleeve H9 is held against rotation by means of a pin I2I carried by the sleeve I04 which rides within an elongated slot I22 in the sleeve H9. A spring I24 is contained Within the sleeve H9 and is interposed between the end of the sleeve H9 and a thrust collar I25.

When fluid under pressure is admitted to the cylinder chamber I26, toggle levers H5 and II 6 are moved from the dotted line positions H5a and Ba into the full line positions H5 and H6 (Fig. 9) which serves to move the sleeve H9 into the position illustrated which in turn serves to compress the spring I24 and, through the connecting parts, move the sleeve I04 and footstock center I00 into operative supporting engagement with the end of the camshaft 24.

In order readily to control the movement of the footstock center, a control valve I28 is formed integral with the cylinder H0. The valve I28 is preferably of a piston type and serves to control the admission of fluid passing through the pipe I29 to the cylinder. A control lever 130 which is pivotally mounted on a stud I3I carried by the valve casing I 23 is connected by a stud I32 with a spool shaped member I33 carried by a valve stem I34. The valve I28, as shown in Fig. 10, is in a neutral position. If the lever I is moved either clockwise or counterclockwise (Fig. 10) fluid is admitted either through a passage I35 into cylinderchamber I26 to cause the pistons III to move downwardly and the footstock center I00 to move into an operating position in engagement with the Work, or may pass through a passage I36 into a cylinder chamber- I31 to cause the piston III to move upwardly,

and to thereby withdraw the footstock center I00 from supporting engagement with the camshaft .the lapping elements.

Time control mechanism It is one of the objects of this invention to provide a suitable time control mechanism whereby'a work piece, such as the camshaft 24, may be rotated for a predetermined time interval to produce the desired finish on the surface of the work piece. In the preferred construction, a counting mechanism is provided which serves automatically to stop the lapping operation after the work piece has rotated a predetermined number of rotations in engagementfwith This mechanism is preferably contained within the headstock 22 and has been illustrated in Fig. 14. The headstock spindle 40 carries an eccentric I40 which is engaged by a roller I4I mounted on a stud I42.

The stud I42 is carried by a lever I 43 which has a downwardly extending projection I44 which is rotatably supported on a shaft I45. The shaft I45 is held in a fixed position relative to the headstock frame 22. The shaft I45 is provided with a flanged portion I46. A bushing I41 fits The end of the toggle within an aperture I49 in the headstock frame 22 and a shoulder thereon engages an inner surface of the casing 22 of the headstock. A plurality of screws I49 serve to clamp the flange I46 rigidly to the bushing I41 and to hold both of said members in fixed relation with the headstock casing 22. The rock arm I43 and I44 carries a stud I which pivotally supports a plurality of pawls I56. The pawls I56 are arranged to engage a ratchet wheel I51 which is rotatably supported on the shaft I45. The pawls I56 are preferably four in number, each of which is of a slightlydifi'erent eifective length, the dilference betweensaid pawls being substantially equal to one-quarter of a tooth on said ratchet wheel I51, thus permitting a fine adjustment of the movement of the ratchet wheel I51 so that it may be moved'by small increments of one-quarter of a tooth or by larger increments constituting one or more teeth of the ratchet at each actuation of the pawls I56.

In order to hold the clutch 49 in a driving po- I sition in engagement with the clutch member to connect the shaft 46 with the shaft 50, the shaft 11 is provided with an arm I60 which is fixed to the shaft 11 by means of a set screw I59, so

that when the shaft 11 is rocked,the member I60 will be rocked thereby. .The lever I60 carries a pivotally mounted detent IBI which is carried by a stud 162 on the arm I60. A stop pin I66 serves to limit the movement of the detent I61 in a clockwise direction, and a spring I64 interposed between a stud 165 on the detent I61 and a stud I66 on the arm I60 serves to normally hold the detent 161 in the position illustrated in Figs. 14 and 15.

An adjustably positioned eccentric I10 is formed integral with the bushing I41 and serves noted that in the position of the parts (Fig. 14),

the stud I and the effective portion of the detent I6I engage the eccentric I10 at a point slightly beyond 'a line or plane passing through the axis of the stud 162 and the axis of the shaft I45, so that the detent I61 is thereby held in position (Fig. 14) to lock the clutch 49 in a driving position, The clutch 49 remains in driving engagement with the work piece until a pivotally mounted detent I15 carried by the ratchet wheel I51 engages the stud 165 and rocks the detent I6I in a counterclockwise direction, thereby unlocking the parts, and the released tension of the spring 83 serves to rock the lever 16, the lever arm 160 and the clutch 49 to disengage the same and to apply the brake and thereby rapidly stop the rotation of the headstock spindle and the camshaft being lapped.

It is desirable to provide a readily accessible means to adjust the lapping period, that is the number of rotations of the camshaft or work piece while in engagement with the lapping element. This may be accomplished by providing an adjustable shield 116 which is pivotally mounted on the shaft I45 and has adownwardly extending projection I11 which is connected by a pin I18 with a link I19. The link I19 is connected by a stud I88 with a rock arm I8I which is pivotally mounted on the shaft 11. The upper end of the rock arm I8I is formed as a yoked member I82 which straddles a pin I83 carried by a nut I84. The nut I84 meshes with or engages a correspondingly threaded screw I85 which is rotatably supported in a bearing I86 in the headstock casing 22. An adjusting knob I81 is mounted on the outer end I88 of the screw I85 projecting outside the headstock. By rotation of the adjusting knob I81, the position of the nut I84 may be adjusted lengthwise of the screw I85 which in turn serves to rock the arm I8I and, through the link I19, serves to rock the pawl shield I16 so as to vary the effective motion of the pawls I56 as desired. By adjusting the position of the shield I16 relative to the pawls I56, the extent of movement of the ratchet wheel I51 may be varied from one-quarter of one tooth to several teeth, as desired. By this adjustment, the lapping period may be adjusted so that the work piece or camshaft 24, to be lapped, may be rotated a predetermined number of turns and then automatically stopped. The greater thenumber of teeth of the ratchet wheel picked up at each actuation ofthe pawl I56, the shorter the lapping cycle and the lesser the number of teeth pickedup at each actuation of the pawl I56, the longer the lapping cycle or period.

It is desirable to provide a manual means for stopping the lapping cycle at any time during the lapping operation, if desired. A manually operable bell crank lever I98 is pivotally mounted on a stud I9I carried by the control lever 16. The short arm of the bell crank lever I98 carries a pin I92 which is connected to the upper end of a link I93. The lower endof the link I93 is connected by a pin I94 with a rock arm I95 which is mounted on the outer end of a shaft I96. The shaft I96 is a relatively short shaft carried in an aperture I91 within the shaft 11. The upper surface of the shaft 11 is provided with a slot I98. A pin I99 passes through the slot I98 and is screw threaded into shaft I96. The pin I99 is provided with a stud 288 which rides within an elongated slot 28I in a link 282 supported within a slotted portion 283 of the lever I68. The other end of the link 282 is provided with an elongated slot 284 which is connected by a pin 285 with the upper end of the detent I6I. By rocking the bell crank lever I98 in a clockwise direction toward the lever 16, the detent I6I may be rocked in a counterclockwise direction so as to unlock the lever I68 and allow the released tension of the spring 83 to disengage the driving clutch and to brake the rotation of the shaft 58, thus providing a readily accessible means for stopping the lapping operation at any time during the cycle,

if desired.

Lapping arm support It is desirable to provide a movable support for a plurality of lapping arms so that they may be simultaneously and quickly moved into an operating or an inoperative position, as desired. A pair of spaced supporting arms 2I8 and 2H are mounted on a rock shaft 2I2 which is supported in bearings on the rear,,of the machine base. The arms 2| 8 and 2 are connected by two spaced bars 2I3 and 2I4 which serve as slide bars or ways for a pair of spaced slides 2I5 and 2I6, each of which is arranged to support a plurality of cam lapping arms to be hereinafter described.

It is desirable to reciprocate the cam lapping arms at a rapid rate to cause a relative longitudinal movement between the lapping arms and the cam being lapped. If a heavy mass is reciprocated rapidly, the rapid movement and reversal sets up vibrations within the machine which detrimentally affect the lapping operation. In order to overcome this difllculty and to reduce vibration to a minimum, it is desirable to divide the lapping arms into two or more sets, each set of which is mounted on a separate slide, and to reciprocate the slides simultaneously in opposite directions so that the tendency to set up vibrations within the parts is reduced to a minimum. As illustrated in the drawings, two slides 2 I5 and 2I6 have been provided, each slide being arranged to support half of the lapping arms.-

Cam lappi g and reciprocating mechanism A motor driven reciprocating mechanism has been provided for reciprocating the slides 2I5 and 2I6 so as simultaneously to reciprocate the two sets of lapping arms in opposite directions. An electric motor 2I1 is mounted on a projecting shelf 2I8 which is carried by the rock shaft 2I2. The motor 2I1 is provided with a drive shaft 2I9 having a driving pulley 228 which is connected by a driving belt 22I with a pulley 222 which is mounted on the outer end of a transversely mounted rotatable shaft 223. The shaft 223 is journaled in bearings 224 and 225 in a frame 226 carried by the guide bars 2| 3 and 2M. The shaft 223 carries two eccentrics 221 and 228 which are arranged with their throws in dia-- Master camshaft In order that the cam lapping arms to be hereinafter described may be maintained in uniform lapping engagement with the cams on the camshaft, a master camshaft 248 is rotatably journaled in bearings I, 242 and 243 which are carried by the bracket 2'26 and a bracket 244 .and 245 carried by the guide rods 2I3 and 2.

The master camshaft 248 is identical with the shaft 24 to be lapped.

It is desirable to provide a suitable driving mechanism for the master camshaft 248, whereby the rotation of the master shaft 248 and the shaft 24 to be lapped may be synchronized. In the preferred form, the rotary motion of the headstock spindle 48 is transmitted through a driving mechanism to rotate the master camshaft 248 in synchronism therewith. A sprocket 258 is mounted on the headstock spindle 48 and is connected by a link chain 25I with a sprocket 252 rotatably supported on the rock shaft 2I2. A second sprocket 253 is rotatably mounted on the rock shaft 2I2 and is connected by a link chain 254 with a sprocket 255 mounted on a driven shaft 256 whichis journaled in bearings 251 in the supporting arm 2I8. An adjustably positioned idler sprocket 258 is rotatably supported on an eccentric 259 carried by a shaft 268 mounted on the arm 2I8. By adjusting the eccentric relative to the sprocket 258, the tension sired. An idler sprocket 261 is rotatably supported on an adjustable bracket 262 and serves to tension the link chain 251.

The shaft 256 carries a driving plate 262 which is connected through a plate 263 which is keyed to the end of the master camshaft 246. It will.

readily be apparent from the foregoing disclosure that when the headstock spindle 46- is rotated, a rotary motion will be transmitted through the sprocket 256, link chain 251, sprocket 252, sprocket 253, link chain 254, sprocket 255, to rotate the shaft 256, and through the connections 262-263 to rotate the master camshaft 246 in synchronism with the rotation of the camshaft to be lapped.

In order that all of the cams on the camshaf may be simultaneously lapped, a plurality of cam lapping arms 216 are mounted on each of the longitudinally movable slides 215 and 216. The cam lapping arms 216 are positioned and arranged so that an abrading end thereof operatively and simultaneously engages each of the cams on said camshaft 24 to be lapped. Only one of the cam lapping arms has been shown in detail, as illustrated in Figs. 3 and 8, but the entire assembly and arrangement thereof has been illustrated in Fig. 2. The lapping arms 216 are provided with a hollow frame which is provided on its lower surface with a dovetailed way 211 which mates with a correspondingly shaped .way 212 on the slide 215 or 216. A gib213 together with an adjusting screw 214 serves to facilitate adjustment of the arm 216 longitudinally on the slides 215 and 216 to position the cam lapping arms in the desired relationship with the cams to be lapped.

Each of the lapping arms 216 is provided with a longitudinally extending aperture 215 which is adapted to receive a slide 216. The slide 216 .is supported on its lower surface on a 'pair of spaced rollers 211 and 218 which are rotatably supported on studs 219 and 286 respectively, thus furnishing an anti-friction support for the transversely movable slide 216. In order to maintain the slide 216 in operative contact with the supporting rollers 211 and 218, a pair of rollers 285 and 286 are supported on studs 291 and 286 which are in turn carried by an adjustable member 289. The member 289 may be adjusted in a vertical direction by means of an adjusting screw 296 carried by a projection 291 of the arm 216. By adjusting the screw 296 vertically, the rollers 285 and 286 .may be adjusted relatively toward or from the rollers 211 and 216 so as to take up any play or lost motion between the slide 216 and 'the arm 216.

The rear end of the slide 216 is formed as a 298 in the end cap 294 and are screw threaded into the arms 292 and'293'. The end cap 294 supportsa master cam follower roller 366 which is arranged to engage a master cam 361 on the master camshaft 246. The master cam roller 366 is rotatably mounted on a stud 362 which is supported on the end of a slidably mounted member 363 which may be adjusted relatively toward and from the master cam 361 by means of an adjusting screw 364.

A spring 365 contained within a longitudinally extending slot 366 in the slide 216 is connected face of the master cam stud' 368 carried by the cam lapping arm frame 216, a series of spaced holes being provided for the stud 368 so that the tension 'of the spring a 365 may be varied as desired. The spring 365 serves to maintain the master cam follower roller 366 in operative engagement with the sur- 361 during thelapping operation. I

It is one object of the invention to utilize a flexible abrading member to produce the lapping operation.- In the preferred form, a flexible abrading cloth or paper is utilized and arranged so that afresh abrading surface may be provided at intervals during the operation of the machine. The transverse slide 216 is provided with a nose member 369 which is fixedly mounted on theforward end of the slide 216. The nose member 369 carries a yieldably mounted support 316 which serves as a support for the abrading member when in contact with the work. A roll 315 of flexible abrasive paper or cloth 316 is rotatably supported on a shaft 311 which is in turn supported by brackets 316 and 319 on the arms 216 and 211 respectively. The strip of abrasive paper 316 is passed underneath the slide 215 or 216 and extends toward the front of the machine and around the yieldable member 316 of the nose 369 and is fastened to and wound up on a' spool 326 carried by a stud 321 which is A -rachet wheel 323 carried.

lapping operatioma strip of fairly coarse flexible abrasive cloth 325 extends around the end of the nose piece 363 and is clamped in place thereon by means of a clamping member 326 and 321.

The yieldably mounted nose piece 316 is held in a forward position by means of a spring 328. This spring permits the nose piece 316 to be held in yielding engagement with the periphery of the cam being lapped.

. In order that the abrasive paper and the cam being lapped may be provided with the same relative motion as transmitted by the master cam 361 and its follower roller 366, the yieldable member 316 of the nose 369 is preferably made of a size so that the member 316 together with the flexible abrasive backing and the flexible abrasive lapping paper will form a curvature of substantiallythe same radius as that of the master cam roller 366.. It is readily apparent from this disclosure that any movement transmitted by the "master cam 361 and the follower roller 366 is transmitted transversely by the slide 216 to the nose piece 369 to lap or polish a cam on the synchronously rotated camshaft 24 to the desired finish and contour.

In order thatthe main bearings for the camshaft 24 may be lapped simultaneously with the 'cams on the shaft, a series of bearing lapping arms are provided which correspond in number with the bearings to be lapped. In the present case, there are three main bearings 336, 331 and 332, each of which is lapped simultaneously by means of a plurality of bearing lapping arms 335.

- The bearing lapping arms 335 are each carried by the supporting frames 244, 226 and 245 which are supported on the guide bars 213 and 214. Each of the crank arm supporting frames is provided with a vertically extending arm 331 (Fig. 7) which is connected by a stud 338 with the supporting frames 244, 226 and 245. The upper end of the arm 331 is provided with a stud 338 which supports the bearing lapping ,arm 335.

The bearing lapping arm 335 is provided with a pair of pivotally mounted lapping arms 348 and 341 which are provided at their operating ends with a partially cylindrical lap supporting block 342 and 343, respectively. The other ends of the arms 348 and 341 are connected by toggle levers 344 and 345 which are in turn connected by a link 346 with an actuating lever 341. The lever 341 is pivotally mounted on a stud 348 carried by the lapping arm 335. When the lever 341 is in the position illustrated in Fig. '7, the lap supporting blocks 342 and 343 are in position to hold flexible abrasive cloth or paper 316 in lapping engagement with the bearing being lapped. After the lapping operation has been completed, the lever 341 is rocked in a clockwise direction (Fig. '7) against the tension of a spring 348 which serves to actuate the toggle levers 344 and 345 and to separate the lap .supporting blocks 342 and 343 from engagement with the bearings being pp A flexible abrasive cloth or paper 316 is utilized in connection with the bearing lapping arms 335 which is identical with that used in connection with the cam lapping arms 218. The lap supporting members 342 and 343 are also covered with a strip of relatively coarse abrasive cloth which is clamped in place and serves as a friction device to prevent slipping of the abrasive paper during the lapping or polishing operation. It is not believed to be necessary to describe in detail the arrangement of the spool for supporting the abrasive paper nor the spool for winding up the used abrasive paper since these are identical to those used in connection with the cam lapping arm and the corresponding reference numerals have, therefore, been applied to the corresponding parts in the drawings.

In order to facilitate loading of camshafts 24- into the machine and removal of finish lapped camshafts therefrom, it is desirable to move the entire assembly of cam lapping arms 218 and bearing lapping arms 335 simultaneously to an inoperative position. It is, therefore, desirable to provide a readily operable means for rocking the arms 218 and 211 on the rock shaft 212 so that the entire assembl of lapping arms. may be rocked simultaneously in a counterclockwise direction about the shaft 212 as a pivot. The arms 218 and 211 are each provided with a locating surface 358 which engages a surface 351 on I the base 28 to locate the arms 218 and 211 in an operative position with the cam lapping arms 218 and the bearing lapping arms 335 in operative position with relation to the camshaft 24 to be lapped.

In order to move the entire assembly to an inoperative position, a fluid pressure mechanism is provided. A fluid pressure cylinder 368 is pivotally connected by means of a stud 361 within the base 28. A slidably mounted piston 362 is contained within the cylinder 368 and is connected to one end of a piston rod 363. The other end of the piston rod 363 is connected by a pin 364 with an arm 365 pivotally mounted on a shaft 366 within the base 28; The arm 365 is provided with a stud 361 which also is connected to one end of a link 368. The other end of the link 368 is connected by a stud 368 with toggle levers 318'and 311. The toggle lever 318 is connected by a stud 312 with the base 28, and the toggle lever 311 is connected by a stud 313 with an arm 314 which is mounted on the rock shaft 212 and arranged to rock the shaft 212 together with the arms 218 and 211 and all of the cam lapping arms 2111 and bearing lapping arms 335 together with their supporting and actuating mechanisms either into or away from an operative position.

A fluid pressure system is provided to control the admission of fluid under pressure to the cylinder 368. A pump 380 within the base 28 of the machine draws fiuidthrough a pipe 381 from a reservoir 382 withinthe base 28 of the machine and passes fluid under pressure through a pipe 383 to a reverse or control valve 384. The valve 384 is of a balanced piston type having a valve stem 385 which is connected at its outer end with a control lever 386. The control valve 384 is connected by pipes 381 and 388 with cylinder chambers 388 and 388, respectively.- In the position of the valve 384 (Fig. 7), the valve is in a neutral position so that no fluid passes to the cylinder 368. When it is desired to move the lapping arm assembly to an inoperative position, the lever 386 is rocked in a counterclockwise direction so that fluid under pressure passing through the pipe 383 passes through pipe 381 into cylinder chamber 389 and causes the piston 362 to. move upwardly within the cylinder 368 and causes the toggle levers 318 and 311 to move into broken line positions 318a and 311a which serves to rock the lapping arm assembly to an inoperative position, Similarly, after a camshaft 24 has been inserted in the machine, movement of the lever 386 in a clockwise direction (Fig. 7) serves to admit fluid through the pipe 388 into cylinder chamber 388 to cause the piston 362 and the toggle levers 318 and 311 together with their connecting links to move into the full line position (Fig. 7). During the admission of fluid either through the pipe 381 or 388, fluid is exhausted from the inactive side of 'the piston 362 through a pipe 391 into the reservoir 382.

To facilitate loading of the machine, that is removal of a lapped piece of work from the machine and loading a new piece of work therein, it is desirable to provide means for automatically moving the work driver 86 toward the left when the lapping arms are moved'to an inoperative position. This is preferably accomplished by connecting a link chain 488 with the lower end of the lever 84; The link chain 488 passes around an idler pulley 481 and is connected at its other end to the arm 211. When the lapping arm supports 218 and 211 are moved to an inoperative position, the link chain 488 is moved with the arms, causing the lever 94 and the yoked member 31 to rock in a counterclockwise direction (Fig. 13) to withdraw the work driver 86 from engagement with the end of the camshaft 24 so that the lapped work piece may be readily removed there- I from after the lapping operation has been completed.

Lubricant nozzle or valve M6 is provided to direct cuttin driven by a motor 4 to pass lubricating fluid from a reservoir (not shown) within the base 28 through a pipe 2, a valve 413 which is controlled by. a lever M4, and through a pipe surfaces to be lapped or polished. A separate lubricant to each of the portions of the work pieces to be lapped. As illustrated in Fig.1,

these nozzles are small petcocks, each of which independently is adjustable so that the desired amount of cutting lubricant may be applied.

v It is desirable to stop the flow of cutting lubricant when the machine is in a loading position.

A spring 4|! connected between the lever M4 and a stud 418 on the base 28 serves to hold the cutting lubricant valve 4l3 open during the lapping operation. In order automatically to close the ,valve '413 during the loading interval, a chain 419 is connected between the control lever M4 and the arm 2 which serves as one of the supports for the lapping arm assembly. When the lapping assembly rocks in a clockwise direction to an inoperative position, the arm 2 pulls on the chain 9 and rocks the control lever 414 of the lubricant valve 4 l 3 in a clockwise direction to close the valve and thereby stop the flow of coolant fluid during the unloading and loading operation.

In order to simplify the control of the machine and to eliminate unnecessary movements in the control thereof, a connection is provided whereby movement of the footstock center H14 into operative engagement with the end of the camshaft 24 to be lapped serves to actuate the control valve 384 and thereby move the lapping arm assembly, namely the cam lappingarms and bearing lapping arms, immediately into an operative position. A downwardly extending arm 425 which is pivotally connected to the stud l l3 connecting the toggle levers I I5 and 4 i8 is connected to a pin 426 with links 421. The lower end of the links 421 are provided with a stud 428 which is connected to one end of a lever 429, the other end of which is pivotally mounted on a stud 438 carried by a bracket 43! on the base 28 of the machine. The levers 429 and 386 are each pinned or otherwise affixed to the stud or shaft 430 so that in effect the levers 38,6 and 429 constitute a bell crank lever. It will readily be apparent from this disclosure that when the lever I38 is shifted to admit fluid to the cylinder chamber 126 to cause the footstock center lllll to move into supporting engagement with the camshaft 24, the movement of the toggle levers H5 and H6 into a straight-line position (Fig. 9) serves to cause a downward movement of the links 421 which serves to rock the bell crank lever 429386 in a clockwise direction which serves to actuate the fluid pressure control valve 384 so as to pass fluid 388 into cylinder chamber 394 to cause the It is desirable to stop the reciprocation of the cam lapping arms when the lapping arm assembly is moved to an\ inoperative position. An electric switch 449 is provided to control the electric motor 2!! which reciprocates the slides M5 and 2| 6. At the start of the lapping operation, a push button 441 is manually pushed to start the motor 2|] to reciprocate the cam lapping arms 218. It

desirable automatically to stop the reciprocation after the lapping operation has been completed. At the end of the grinding cycle it is desirable, when the timing mechanism is rendered effective. to stop the rotation of the work piece and automatically and immediately to stop the reciprocation of the lapping elements. The control lever 16 is provided with an outwardly extending arm 442 which carries an adjustable stop screw 443 which is arranged in the path ofa push button 444. When the timing mechanism operates to stop the lapping operation, the lever 16 is moved in a clockwise direction (Fig. 14), the stop screw 443 engages the stop button 444 to open the switch 440 and thereby stop the rotation of the motor 2H and the reciprocation of the slides 2l5 and 2l6 which support the cam lapping arms 2111.

Operation operative engagement with the work serves.

through the toggle levers M5 and'llfi and bell crank lever 429388 to actuate the control valve 384 to move the lapping arm assembly into the operative position (Fig. '7) with the cam lapping arms 2'44 and the bearing lapping arms 335 adjacent to the surfaces to be lapped. A push button 445 is then operated to start rotation of the motor 43 which rotates the headstock spindle 48'. The lever '46 then is moved into theposition illustrated in Fig. 14 which serves to move the clutch member 49 toward the right (Fig. 14) to start the rotation of the headstock spindle 40, the camshaft 24 to be lapped, and the master camshaft 240. This movement of the control lever '48 serves not only to start the rotation of the camshaft but also to actuate the push button 444 to A cam-- The lever 430 is then supporting engagement with the flange on the end of the camshaft. At.the same time, the rocking of the arm- 2H into the position illustrated in Fig. 6 serves to open the cutting lubricant valve M3 to supply cooling or cutting lubricant to the camshaft and lapping elements, as desired. The lapping operation continues for a definite number of rotations of the camshaft to which the mechanism has been set. Movement of the clutch 49 from a clutching to a braking position stops the camshaft 524 from rotating as well as reciprocating. The movement of the control lever' iii in a clockwise direction causes the stop screw 443 to actuate the push button 444 to open the switch 448 and stop the rotation of the motor 2 l l which stops the reciprocation of the cam lapping arms 21!]. The footstock control lever I38 is then actuated to cause a withdrawal of the footstock center I00. This movement serves simultaneously to actuate the valve 384 to cause the arms 2"] and 2 which support the lapping arm assembly to move to an inoperative position. a

When the lapping arms are moved into an op erating position, it is necessary for the operator to actuate the lever 341 on each of the bearing lapping arms 335 to close the lap supporting members 342 and 343 on the bearings to be lapped. Similarly, after the lapping operation has been completed, it is necessary for the operator manually to move all of the levers 341 in a clockwise direction (Fig. 7) to release the lap supporting members 342 and 343 from engagement with the workbefore the lapping assembly is moved through an inoperative position.

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in 'the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

We claim:---

1. A camshaft lapping machine having a rotatable camshaft support rotatabiy to support a camshaft to be lapped, means to rotate a cam-. shaft supported thereon, a movable cam lapping arm, a lapping element on said arm arranged to engage a cam on said camshaft to be lapped, a rotatable master camshaft having a master cam thereon, means to synchronize the rotation of the camshaft and master camshaft, and a follower on said lapping arm which engages a master cam to move the lapping arm transversely so as to maintain the lapping element in uniform lap ping engagement with said cam during the lapping operation.

2. A cam shaft lapping machine having a rotatable camshaft support rotatably to support a camshaft to be lapped, means to rotate a camshaft supported thereon, a plurality of movable lapping arms, a lapping element on each of said arms which is arranged to engage a cam on said camshaft to be lapped, a rotatable master camshaft having a plurality of master cams thereon, means to synchronize the rotation of the camshaft and master camshaft, and a follower on each of said arms which engages a master cam independently to move the lapping arms simultaneously to lap a plurality of cams on said shaft.

3. A camshaft lapping machine having a rotatable camshaft support rotatably to support a camshaft to be lapped, means to rotate a camshaft supported thereon, a plurality of transversely movable cam lapping arms, a lapping member on each of said arms which is arranged to engage with a cam to be lapped, a rotatable master camshaft having a plurality of master cams, means to synchronize the rotation of the camshaft and master camshaft, a follower on each of said arms which engages a master cam independently to move the lapping arms transversely to lap simultaneously a plurality of cams, and means relatively to reciprocate said camshaft and cam lapping arms during rotation of said camshaft to produce a predetermined lapping operation on said cams.

4. A camshaft lapping machine having a rotatable camshaft support for supporting a camshaft having a plurality of cams thereon, means to rotate said camshaft, a pair of longitudinally reciprocable slides, a plurality of movable cam lapping arms on each of said slides, a lapping element on each of said arms which is arranged to engage a cam to be lapped, a master camshaft having a plurality of master cams, a follower on each of said arms which engages a master cam independently to cause a transverse movement of said arms, and means relatively to reciprocate said camshaft and cam lapping arms during rotation of said camshaft to produce a predetermined lapping operation.

r 5. A camshaft lapping machine having a rotatable camshaft support for supporting a camshaft having a plurality of cams thereon, means to rotate said camshaft, a pair of longitudinally reciprocable slides, a plurality of movable cam lapping arms on each of said slides, a lapping element on each of said arms which is arranged to engage a cam to be lapped, a master camshaft having a plurality of master cams, a follower on each of said arms which engages a master cam independently to cause a transverse movement of said arms, and means to reciprocate said slides simultaneously in opposite directions to cause said cam-shaft and cam lapping arms during rotation of said camshaft to produce a predetermined lapping operation:

6. A camshaft lapping machinehaving a rotatable camshaft support for supporting a camshaft having a plurality of cams thereon, means to rotate said camshaft, a plurality of spaced longitudinally reciprocable slides, a plurality of transversely movable cam lapping arms on each of said slides, a lapping element on each of said arms which is arranged to engage a cam to be lapped, a master camshaft having a plurality of master cams thereon, means synchronously to rotate the camshaft and master camshaft, a follower on each of said arms which engages a master cam independently to cause a transverse movement of said arm, and a yieldable support for each of the lapping elements on said arms which serves to maintain the lapping elements in engagement with the cams being lapped at the desired pressure.

7. A camshaft lapping machine comprising a rotatable camshaft support for a camshaft having a plurality of cams thereon, a plurality of movable cam lapping arms each arranged to engage a cam to be lapped, a master camshaft having a plurality of master cams thereon, means to rotate said camshaft and said master camshaft in synchronism, a follower on each of said arms which engages a master cam independently to controlthe transverse movement of said arms, a yieldably mounted nose piece on each of said arms, and a flexible abrasive strip wrapped around each of said nose pieces to engage and simultaneously lap all of said cams.

8. A camshaft lapping machine having a rotatable camshaft support including a headstock and a footstock for supporting a camshaft having a plurality of cams thereon, a pair of spaced longitudinally reciprocable slides, a plurality of movable cam lapping arms on eachof said slides, each arm being arranged to engage a cam to be lapped, a master camshaft having a plurality of master cams, a follower on each of said arms which engages a master cam independently to cause a ible abrasive strip around each of said nose pieces- 2,092,734 to engage and simultaneously lap all of said cams,

and means simultaneously to reciprocate said slides and lapping arms in opposite directions at a rapid rate. v

9. A camshaft lapping machine having a rotatable camshaft support, a pivotally mounted frame, a pair of spaced longitudinally reciprocable slides on said frame, a plurality of transversely movable cam lapping arms on each of said slides, a lapping element on each of said arms which is arranged to engage a cam to be lapped, a master camshaft carried by said frame and having a plurality of master cams, means synchronously to rotate the camshaft and master camshaft, a follower on each of said arms arranged to engage a master cam independently to cause a transverse movement of said arms, means to reciprocate said slides simultaneously in opposite directions, means including a fluid pressure operated piston and cylinder to move said frame to and from an operating position, and a fluid pressure system including a control valve which is arranged to admit fluid under pressure to cause said frame-to move either to or from an operative position.

' 10. A camshaft lapping machine having a rotatable camshaft support including a headstock having a rotatable spindle to support said work,

a fluid pressure operated footstock which is arranged to support the other end of a camshaft, a fluid pressure control valve operatively connected to move said footstock either into or out of engagement with a camshaft, means to rotate said headstock spindle, a movable frame 011 said machine, a plurality of transversely movable lapping arms carried by said frame each of which isarranged to engage a cam to be. lapped, a master camshaft having a plurality of master cams, means to rotate said master camshaft synchronously with the camshaft, a follower on each of said arms which engages a master cam independently to cause a transverse movement of said arms during a lapping operation, fluid pressure operated means including a piston and cylinder operatively connected to move said frame to position said cam lapping arms either in an operative or inoperative position, a control valve for said cylinder, and connections between said footstock and said control valve whereby the control valve is shifted to move said frame into an'operative position when the, footstock is moved into supporting engagement with a camshaft.

11. A camshaft lapping machine having a rotatable camshaft support including a headstock having a rotatable spindle to support said work, a fluid pressure operated footstock which is arranged to support the other end of a camshaft, a fluid pressure control valve operatively connected to move said footstock either into or out of engagement with a camshaft, means to rotate said headstock spindle, a movable frame on said machine, a plurality of transversely movable lapping arms carried by said frame each of which is arranged to engage a cam to be lapped, a master camshaft having a plurality of master cams, means torotate said master camshaft synchronously with the camshaft, a follower on each of said arms which engages a master cam indefor said cylinder, and connections between said control valve and the footstock which are arranged to shift said control valve to cause the frame to move to an inoperative position when the footstock is withdrawn from supporting engagement with a camshaft after a lapping operation.

12. A camshaft lapping machine having a rdtatable camshaft support arranged rotatably to support a camshaft having a plurality of cams thereon, a plurality of cam lapping arms, a yieldably mounted nose member on each of said arms to support a lapping element, a lapping element supported by each of said nose members, a movable frame on said machine which is arranged to support said lapping arms, a master camshaft supported thereon having a plurality of master cams, means synchronously to rotate the camshaft and master camshaft, a follower on each of said arms which engages a master cam independently to cause a transverse movement of said arms during a lapping operation, means including toggle levers to move said frame to and from an operating position and to lock said actuate said toggle levers to move the frame and lapping arms to and from an operating position.

13. A camshaft lapping machine having a rotatable camshaft support. arranged rotatably to support a camshaft having a plurality of cams thereon, a plurality of cam lappingarms, a yieldably mounted nose member on each of said arms to support a lapping element, a lapping element supported by each of said nose members, a movable frame on said machine which is arranged to supportsaid lapping arms, a master camshaft supported-thereon having a plurality of master cams, means synchronously to rotate the camshaft and master camshaft, a follower on each of said arms which engages a master cam independently to cause a transverse movement of said tuate said toggle levers to position said frame and cam lapping arms either in an operative or inoperative position, and a control valve which is arranged to control theladmission of fluid under pressure to said cylinder.

14. A camshaft lapping. machine comprising a rotatable camshaft support to support a camshaft having a plurality of cams thereon, a pivotally mounted frame, a plurality of transversely movable cam lapping arms each having a yieldable nose member, a lapping element on each of said nose members each arranged .to engage a cam on said camshaft, a plurality of bearing lapping arms on said frame, a lapping element carried by each of said bearing lapping arms and arranged to engage a bearing surface on said camshaft, means including toggle levers which are arranged to move said pivotally mounted frame to and from a-predetermined operating position and to apply a predetermined pressure to said nose pieces when in an operating position,

15. A camshaft lapping machine comprising a rotatable camshaft support including a head and footstock, a rotatable headstock spindle, means including a clutch to rotate said spindle, a, plurality of transversely movable cam lapping arms, a. master camshaft having a plurality of master cams each arranged to move one of said lapping arms, a followerpn each of said arms in engagement with a master cam, means to synchronize the rotation of said headstock spindle and master camshaft, a longitudinally reciprocable slide to support said lapping arms, means including an electric motor to reciprocate said slide rapidly to cause a reciprocation between the cam lapping arms and the rotatable camshaft support to produce the desired lapping action, means including an electric switch to start said reciprocating motor at the start of a lapping operation, means automatically to disengage said clutch after a predetermined lapping operation has been completed, and means actuated upon disengagement of said clutch automatically to actuate said switch to stop said motor and the reciprocation of said lapping arms.

16. A camshaft lapping machine comprising a rotatable camshaft support including a headstock and a footstock rotatably to support the opposite ends of a camshaft having a plurality of cams thereon, means. to rotate said camshaft, a plurality of transversely movable cam lapping arms, a lapping element on each of said arms which is arranged to engage a cam to be lapped, a master camshaft having a plurality of cams thereon; means to rotate said camshaft and master camshaft in synchronism, a follower on each of said arms .which engages a master cam independently to control the transverse movement of said cam lapping arms, means to reciprocate said cam lapping arms during rotation of said shaft to cause a lapping operation on said cams, a plurality of bearinglapping arms each having a lapping element arranged to engage and lap a bearing on said camshaft, and means to reciprocate said work support during the lapping operation to cause a lapping action between the bearing lapping arms and the bearings and to produce a further relative motion between the cams and the cam lapping arms to increase the lapping action therebetween.

17. A camshaft lapping machine comprising a rotatable camshaft support including a headstock and a footstock, a plurality of transversely movable cam lapping arms, a lapping element carried by each of. said arms and arranged to engage a cam to be lapped, a master camshaft having a plurality. of master cams thereon each arranged to move one of said lapping arms, a follower on each of said lapping arms in engagement with a master cam, means to rotate said master camshaft in synchronism with the rotation of the camshaft being lapped, means to reciprocate said lapping arms rapidly during rotation of said camshaft to produce a lapping action thereon, a plurality of bearing lapping arms, a lapping element carried by each of said arms and arranged to engage'a bearing on said camshaft, means to reciprocate said work support to cause a relative longitudinal movement between the bearing lapping arms and the bearings being lapped and to increase the relative longitudinal movement between the cam lapping arms and the cams being lapped, a pivotally mounted support which supports the cam lapping and bearing lapping arms, a fluid pressure operated cylinder and piston operatively connected to move said lapping arms to and from an operating position, and a manually operable control valve which admits fluid under pressure to cause said cam and bearing lapping arms to move either into or away from an operative position.

18. A camshaft lapping machine comprising a rotatable camshaft support including a headstock and a footstock, a movably mounted frame, a plurality of cam lapping arms carried by said frame, a lapping element on each of said arms which is arranged to engage a cam to be lapped, a plurality of bearing lapping arms on said frame, a lapping element carried by each of said arms and arranged to engage a bearing to be lapped, means to cause a relative reciprocation between said work support, cam and bearing lapping arms, a movable frame to support said cam and bearing lapping arms, means including a. fluid pressure operated cylinder and piston to move said frame to position the cam lapping and bearing lapping arms either in an operative or inoperative position, a valve operatively connected to control the admission of fluid under pressure to said piston and cylinder, a coolant fluid system including a plurality of nozzles arranged simultaneously to convey a coolant fluid to each of said lapping elements, cams and bearings, a valve arranged to stop and start the flowof coolant fluid, and connections between said valve and said frame whereby the fluid is turned on when the frame moves the lapping arms into an operative position and closes the valve when the frame moves the lapping arms to an inoperative position so that the coolant fluid is automatically cut off during the loading of the machine.

19. A cam lapping arm comprising a supporting frame, a movable arm carried by said frame, a master cam to control the movement of said arm, a follower on said arm, yieldable means interposed between said arm and said frame to maintain the follower in engagement with said cam, a yieldable nose on said cam, and an abrasive lapping element supported on said nose to produce a predetermined lapping operation.

20. A cam lapping arm comprising a frame, a transversely movable arm carried thereby, antifriction supports for said arm, means to adjust said anti-friction supports to take up lost motion in said parts, a cam to move said arm transversely, a follower on said arm arranged to engage said cam, a spring interposed between saidarm and frame to maintain said follower in engagement with said cam, a yieldably mounted nose on said cam, a side guide adjacent to said nose, a flexible abrasive lapping element between said guides and wrapped around said nose, and means to supply a fresh portion of abrasive when desired.

21. A cam lapping arm comprising a frame, a transversely movable arm carried by said frame, an adjustable anti-friction support for said arm interposed between the arm and the frame, a cam to move said arm transversely, a follower on said arm engageable with said cam, yieldable means interposed between said frame and arm to maintain the follower in engagement with said cams, a yieldably mounted nose on said arm, a reel of flexible abrasive carried by said arm and arranged to wrap around said nose, side guides on said nose to locate abrasive relative to the nose, means to adjust the tension of said yieldable nose, and means to adjust the position of said follower to position the nose in the desired position.

HERBERT S. INDGE.

\, H GEORGE E. 'HULBERT. 

